MS SQL: Fix collation issues when retrieving default values

MS SQL: Fix collation issues when retrieving default values

I was getting this error:
Error in query (4189): Cannot convert to text/ntext or collate to 'Czech_100_CI_AI_SC_UTF8' because these legacy LOB types do not support UTF-8 or UTF-16 encodings. Use types varchar(max), nvarchar(max) or a collation which does not have the _SC or _UTF8 flags.

This reverts part of a2adb67.